Metal–Organic Framework Materials with Ultrahigh Surface Areas: Is the Sky the Limit?
摘要:
We have synthesized, characterized, and computationally simulated/validated the behavior of two new metal organic framework (MOF) materials displaying the highest experimental Brunauer-Emmett-Teller (BET) surface areas of any porous materials reported to date (similar to 7000 m(2)/g). Key to evacuating the initially solvent-filled materials without pore collapse, and thereby accessing the ultrahigh areas, is the use of a supercritical CO2 activation technique. Additionally, we demonstrate computationally that by shifting from phenyl groups to "space efficient" acetylene moieties as linker expansion units, the hypothetical maximum surface area for a MOF material is substantially greater than previously envisioned (similar to 14600 m(2)/g (or greater) versus similar to 10500 m(2)/g).
Designing Higher Surface Area Metal–Organic Frameworks: Are Triple Bonds Better Than Phenyls?
作者:Omar K. Farha、Christopher E. Wilmer、Ibrahim Eryazici、Brad G. Hauser、Philip A. Parilla、Kevin O’Neill、Amy A. Sarjeant、SonBinh T. Nguyen、Randall Q. Snurr、Joseph T. Hupp
DOI:10.1021/ja302623w
日期:2012.6.20
We have synthesized, characterized, and computationally validated the high Brunauer-Emmett-Teller surface area and hydrogen uptake of a new, noncatenating metal-organic framework (MOF) material, NU-111. Our results imply that replacing the phenyl spacers of organic linkers with triple-bond spacers is an effective strategy for boosting molecule-accessible gravimetric surface areas of MOFs and related high-porosity materials.